That CEL can be a bunch of things... so a code reader will certainly help and it's not worth speculating on what it might be.
I tell you what though... the boxster's brain does NOT like intake mods (different filters, modified airboxes, cone filters, etc.) from all I read on this forum as well as renntech.
One thing you might try is disconnecting your battery for a half hour or so and see if the CEL light goes off. Some folks say this works.
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